1 files changed, 3 insertions, 1 deletions
diff --git a/options.mk b/options.mk
index 33b9250..ba4a636 100644
--- a/options.mk
+++ b/options.mk
@@ -6,7 +6,9 @@ FICS_HOME ?= /home/chess/config
 PREFIX ?= /home/chess
 
 CC ?= cc
-CFLAGS = -O2 -Wall -pipe -std=c11
+CFLAGS = -O2 -Wall -pipe -std=c11 \
+	-Wsign-compare \
+	-Wstrict-prototypes
 
 CXX ?= c++
 CXXFLAGS = -O2 -Wall -pipe -std=c++17